0.9.0

Issues

• [Client] Check HTTP status codes in HttpTransport

  Client
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  modelcontextprotocol/php-sdk#425·ez-lbz opened Aug 16, 2026 · Updated Sep 7, 2026
  2

• [Server] Add outgoing (elicitation, sampling) request and client response events

  breaking changeenhancementneeds reviewServer
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  modelcontextprotocol/php-sdk#386·omouren opened Jun 24, 2026 · Updated Oct 8, 2026
  19

• [Client] Resume interrupted SSE streams

  Client
  Unread
  modelcontextprotocol/php-sdk#463·wWzZb opened Aug 19, 2026 · Updated Oct 7, 2026

• [Client] Fail fast when the stdio server process exits before responding

  Clientenhancement
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  modelcontextprotocol/php-sdk#514·ousamabenyounes opened Sep 26, 2026 · Updated Oct 8, 2026
  1

• [Server] Fix lost responses on concurrent requests of the same session (Streamable HTTP)

  bugP1Server
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  modelcontextprotocol/php-sdk#535·guillaume-sainthillier opened Oct 6, 2026 · Updated Oct 8, 2026
  6

• [Server] Serve both protocol eras over stdio

  2026-07-28improves spec complianceServer
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  modelcontextprotocol/php-sdk#546·chr-hertel opened Oct 7, 2026 · Updated Oct 8, 2026·1/3
  7

• [Client] Probe for 2026-07-28 and fall back to the handshake

  2026-07-28Client
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  modelcontextprotocol/php-sdk#547·chr-hertel opened Oct 7, 2026 · Updated Oct 8, 2026·2/3
  8

• [Schema][Client] Bump default spec version

  2026-07-28breaking changeClientSchema
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  modelcontextprotocol/php-sdk#550·chr-hertel opened Oct 7, 2026 · Updated Oct 8, 2026·3/3
  6

• [Server] Poll only the client request a stream's own fiber sent

  bugP2Server
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  modelcontextprotocol/php-sdk#556·mglaman opened Oct 7, 2026 · Updated Oct 8, 2026
  4